<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

    {{ data.msg }}

    <form action="{{ request.url }}" method="post">
        username: <input name="username"> <br />
        password: <input name="password" type="password"> <br />
        <button type="submit">确认</button>
    </form>

</body>
</html>